The Maintainability Index

Maintainability Index definition
Parameter Name Measures
aveV Average Halstead complexity Computational density
aveV(g') Average extended cyclomatic complexity Logical complexity
aveLOC Average count of lines of code Code size
PerCM Average percent of lines of comments Human insight
Maintainability of the user code
Maintainability index over time in the FreeBSD user-space code.